A probe 8 comprises a housing 10 and a member 20 movable with respect to the housing onto which a stylus 12 may be mounted such that movement of the stylus results in movement of the member and a primary transducer 50, 52 for measuring movement of the member relative to the housing. The member may be located in a precisely defined rest position 22, 24 with respect to the housing, putting the probe in a mechanical datum position. For a combined transducer probe, this enables the primary transduce...

A switching circuit (20) comprising first and second switch terminals (2,3) and a switch (21). The switch (21) comprises a first bipolar transistor (22), having a collector connected to the first switch terminal (2) and an emitter connected to the second switch terminal (3), and a second bipolar transistor (23), having an emitter connected to the first switch terminal (2) and a collector connected to the second switch terminal (3). The switch (21) can be turned on by supply of a control current ...

A novel prostaglandin analogue of the formula: ##STR1## [wherein the symbol represents .beta.-configuration, the dotted line ---------- represents .alpha.-configuration, and the double bond between C.sub.13 -C.sub.14 represents transconfiguration] and cyclodextrin clathrates thereof, and non-toxic salts thereof are useful for the treatment and/or prevention of diseases induced by platelet aggregation, such as thrombosis, or induced by cytodamage.

A digital to anologue converter comprises a plurality of current sources (T.sub.o -T.sub.n) and corresponding selection switches (D.sub.o -D.sub.n) which connect the current sources to an output (3). In order to enable a constant capacitance to be presented at the output (3) regardless of the input digital code a plurality of dummy current sources (T.sub.o -T.sub.n) which take the same form as the current sources (To-T.sub.n) are provided. The dummy current sources have associated selection swit...

An analogue probe 100 includes a fixed structure 110 and a stylus supporting member 112 suspended relative to the fixed structure 110 by three serially connected pairs of leaf springs 114,116,118. Displacement of the supporting member 112 relative to the fixed structure 110 is transduced by three opto-electronic scale and readhead transducers 136,144;138,146;140,148. The distorting effect of bending moments applied to the tip 130 of the stylus 128 upon leaf springs 114,118 is counteracted by an ...

An analogue probe has a fixed structure and a stylus supporting member connected to the fixed structure by three serially mounted pairs of leaf springs interconnected by first and second intermediate members. The stylus supporting member supports an elongate stem upon which a cube, which supports three scales, is mounted. Readheads are mounted on the fixed structure, in register with the scales, to transduce movement of the stylus supporting member in three substantially orthogonal directions. T...

An analogue display includes an electrical sensitive medium enclosed between two sets of electrodes. The two sets of electrodes are registered and overlap to provide background and one or more shaped index characters, each at a plurality of selectable positions. Voltage signals are applied to the electrodes so that the medium is held in an OFF state in the region between selected electrodes, while simultaneously voltage signals are applied so that in other regions of the medium, the medium is in...

The present invention relates to analogue selectors, also known as analogue multiplexers, for audio equipment input source selection. The present invention provides an analogue input selector for selecting one of a number of analogue source devices. The selector comprises a plurality of input connections for coupling to the input sources, each said input connection being connected to a gain controller having at least zero and one or more non-zero gains, said input connection not including a semi...

A novel anthracycline glycoside 2-deoxy-L-fucopyranosyl carminomycinone which is effective for inhibiting the growth of tumors such as leukemia L1210.

An analogue to digital converter has input for receiving an analogue signal and a frequency modulator for modulating the frequency of a carrier signal in dependence upon the analogue input signal. A digital counter counts the time between successive events in the modulated signal to provide digital signals representative of the analogue input signal.