323,179. Harrison, A. June 16, 1928. Telescopes; coin action, thrust.-In coin-operated mechanism permitting the use of a telescope for a determined time interval, a coin while being inserted through a slot a<6> in the cover plate a<5> of a hollow boss e, Fig. 1, that is provided on the telescope tube e<1> in a central position and beneath it, engages an incline b<1> on a lever b to raise this lever and tension a spring d' which imparts movement to a clockwork mechanism determining the time an obturator g is moved to allow vision through the telescope. One end of the spring d<1> is attached to the pivot d' of a lever d<2>, its other end being secured to a plate f<2>, pivoted on the spindle f<4> of the clockwork and carrying a pawl d engaging and driving a ratchet wheel f<3> on the spindle f<4>. The spring is tensioned by the lever b engaging a pin d<4> on the lever d<2>, another pin d' depressing a rod f which through a member f<1> rocks the plate f<2>. The pawl d is disengaged from the wheel f<3>, during this action, by the coin depressing a second lever c which through an upward and lateral extension raises the pawl. A blade spring g<3> carried by the rocking plate f<2> allows a rod g<2> to drop, under the action of a spring or weight, and this rod, being linked to the spindle g<1> of the obturator g, withdraws the obturator from its position obstructing vision. An arm d<9> connected by a rod d<8> to the lever d<2> engages under a member g<4> on the rod g<2> and prevents this rod from dropping until the lever d<2> is returned by a spring a<1> to normal position, the coin having then been forced between the levers b, c and rolled down to a money-box. This mechanism prevents fraud by withdrawing the coin before it is fully inserted, the withdrawal of the coin also depressing again the lever c which disengages the pawl d and allows the spring d' to contract quickly. The rod g<2> is held in its depressed position by a clutch f<6> engaging the member g', until the rod f is returned under the action of the clockwork, when a pin f<5> thereon trips the catch and allows the spring g<3> to return the rod g<2> and restore the obturator to its normal position. The boss e is rotatably mounted on a lateral tubular extension e<10> of a vertical pillar e', being held in position by a returning ring e<12>, containing coiled springs c<12> pressing against a contact plate e". The springs e<13> impose a certain amount of friction by which the tube e<1> is held in the position in which it is set. The pillar e<9> is likewise rotatable about a vertical axis. In a modification, Fig. 3, the coin posses between a pawl releasing lever i<2>, and an actuating lever i. The lever i actuates, through an arm i<8>, the tensioning mechanism which comprises a depending arm i<7> having a slot engaging a pin m<2> on a disc m rotatable on the spindle m<1> of the clockwork, the disc m carrying a pawl i<3> engaging a clockwork wheel m<3>. The spring i<6> is adjustably attached to a lateral arm i<11> on the arm i<7>. The obturator j in the form of a hollow cylinder is carried by an horizontal member j<2> supported by two parallel swinging links j<1>, j<5>, the link j<1> being actuated by a spring n, carried by the arm i', to project and withdraw the obturator through a hole in the telescope tube. The obturator cannot be until a detent l<1> is released from a stop j<4> on the member j<2>. The detent l<1> is pivoted and is released by the coin dropping through to the money-box and engaging an arm l<2>. The stop j<4> is engaged by a lip m<6> on the disc m to prevent the obturator from being returned, until the clockwork has completed its movement. To prevent the lever i from being actuated until all the parts have returned to normal position, it has a pin i<14> engaged by a pawl i<15>. when the obturator is withdrawn, the pawl i<15> being connected to the link j<5> by an odjustable wire i<17>. Thus the lever i cannot be actuated until the obturator is in obstructing position. Registering.-A counter is actuated by an arm on the spindle g<1> of the obturator g, Fig. 1. The link j<5>, Fig. 3, actuates a counter j<6>.