A photographic lens has a first and second positive lens. The first lens is a meniscus lens having a convex object side surface. The second lens is a double-convex lens. The photographic lens satisfies the following conditions: 5.6.ltoreq.f<8; F1>F2; 0.39<F/F1.ltoreq.0.5; 0.15<R1/F<0.19; 1.4<(F/R3)f.ltoreq.3.0; and R3>|R4| wherein F is an overall focal length, F1 is a focal length of the first lens, F2 is a focal length of the second lens, f is a ratio of the overall focal l...

An adjustment-free tiltsensor for application in the fields of geodesy, geophysics and geotechnics, with a tilt angle measuring range greater than .+-.5.degree. to .+-.10.degree. and an essentially enhanced angular resolution better than 1 microradiant, in which an electrolytic liquid and a gas bubble are present in a closed spirit level, the spirit level is curved over an angle of up to 360.degree., a plurality of electrode configurations each having a plurality of electrodes are arranged along...

A yoga mat that may be rolled up tightly and then held closed by straps, which wrap around and encircle the rolled up mat. The straps are affixed to the mat by the ends thereof being sewn to the edge of mat under an attachment strip, which fits along one entire edge of the mat. A shoulder strap is also attached under the attachment strip between the two straps, so that the mat can be carried over the shoulder with both hands and arms free.

A clamp for handling stacked loads of different sizes has a hydraulic circuit capable of selectively causing closing movement of a pair of clamp arms in synchronized unison with each other and thereafter, automatically in response to resistance to closing movement by one but not the other of the pair of clamp arms, causing unsynchronized closing movement of the other clamp arm. Subsequently, upon opening of the clamp, the hydraulic circuit initially causes opening movement of the previously unsy...

A light shield for eye protection in the welding process comprises a holding unit, a base plate, a filter plate and a universal joint. The filter plate, in conjunction with the base plate, is mounted on a universal joint by which the tilt angle thereof with respect to the holding unit can be free adjusted. Since the filter plate is applied closely to the welding target, the area thereof is small, significantly reducing the weight of the light shield. The base plate further includes a lamp for il...

A heat exchanger includes a header pipe, an inlet manifold, an outlet manifold, and coupling members. The header pipe includes a fluid circulation hole inside. The inlet manifold supplies a fluid to the fluid circulation hole of the header pipe. The outlet manifold discharges the fluid from the fluid circulation hole of the header pipe. The header pipe is connected to the inlet manifold and the outlet manifold though the coupling members.

A vehicle (10) includes a hollow transfer device (20), a side translating assembly (40), and a lift mast assembly (90). The transfer device has at least one substantially open end and a longitudinal opening intersecting the substantial open end. The lift mast assembly is cooperatively associated with the transfer device to move the transfer device substantially vertically, and the side translating assembly is also operatively associated with the transfer device to move the transfer device substa...

A turbine vane includes a perforated liner defining an annular cavity between an outside wall of the liner and an inside wall of the vane, an air admission opening for feeding the inside of the liner with cooling air, and an air exhaust opening for exhausting a fraction of the cooling air from the vane. The liner is secured to the vane at one end and free at the other end to slide along an inside edge of the vane under the effects of relative thermal expansion between the liner and the inside wa...

A coaxial line includes an inner conductor, an outer conductor, and a series of insulating material struts located between the inner and outer conductors. At least some of the struts include conduits through which coolant may be supplied and removed. The line further includes connections that permit coolant to be sent through the line. In operation, coolant flows through the connections, along the struts, and into the inner conductor, cooling the coaxial line.

A reflective warning and locating collar for fire hydrants, pylons or support posts to improve their visibility and identity, the collar having a support member defined by a flexible extruded web having flanges along the longitudinal edges to define a channel slot for receipt of an elongate flexible reflective member in web form slidably receivable within the channel, the ends of the reflective member and support member having a plurality of alignable apertures for receipt of a fastening member.