Drawings to Specification. ... The key lever C carries at its rear end an ivory bar W in which are fixed three platinum contacts, of which the outer ones are connected by wires ba, aa to contact-pillars s, sa#39;, and the middle one is in contact with theanbsp;...
|Title||:||Abridgements of Specifications, Class 1-146 ... Period A.D. 1855-1866|
|Author||:||Great Britain. Patent Office|