I. INTRODUCTION Isoscalar giant resonances have been extensively studied since the discovery of the isoscalar giant quadrupole resonance (ISGQR) in the early 1970s [1–3]. The isoscalar giant monopole resonance (ISGMR) was identified in 1977 [4, 5] and was the subject of a number of studies through the 1980s [6–8]. The isoscalar giant dipole resonance (ISGDR) was first reported by Morsch et al. [9] in $^{208}$Pb but was conclusively identified by Davis et al. [10]. Both ISGMR and ISGDR are classified as compression modes and provide information about nuclear incompressibility, K$_{A}$ , from which the incompressibility of infinite nuclear matter, K$_{∞}$, may be obtained [11]. Most of the earlier investigations of the isoscalar giant resonances used inelastic α scat- tering at 100–200 MeV and the strength of a particular giant resonance was assumed to be concentrated in a single peak with a Gaussian or Lorentzian shape. The resonance parame- ters were obtained by multiple-peak fits to the inelastic scattering spectra, after subtraction of a suitable “background” [12, 13]. In the last decade, the Texas A&M (TAMU) group has carried out ( α, α $^{′}$) studies of many nuclei at a bombarding energy of 240 MeV and ex- tracted the strength distributions of various isoscalar giant resonances in a number of nuclei [14–24] using a multipole decomposition analysis (MDA) [25]. Contemporaneously, we have carried out giant resonance measurements using inelastic scattering of 386 MeV α particles at extremely small angles, including 0 ◦ [26–35]. An especially useful feature of our mea- surements has been the elimination of all instrumental background events from the inelastic scattering spectra which was rendered possible by the optical properties of the Grand Raiden spectrometer [36]. Here, we report on measurements of the isoscalar giant resonances in the even-A Sn isotopes (A=112–124) over the excitation-energy range 8.5–31.5 MeV. Previously, giant res- onance measurements on the Sn isotopes have been reported by the TAMU group [7, 37] and KVI group [8], using inelastic α scattering at 120–130 MeV and peak-fitting analyses of spectra. More recently, the strength distributions of various isoscalar resonances have been obtained in some Sn isotopes (A=112,116,124) by the TAMU group [19, 21]. High-quality measurements of the ISGMR over the full range of isotopes provide the opportunity to investigate the asymmetry term, K$_{τ}$ , of the nuclear incompressibility. This term, associated with the neutron excess ( N − Z ), is crucial in obtaining the radii of neutron 3